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| Landscape Guideline | Arc and Tangent Line Form
Arc: any portion of a circle or ellipse.
Tangent: a straight-line segment that meets an arc, but does not break the curve.
Form
• A series of arcs connected by straight-line tangents;
• Only two types of line segments: straight tangents and arcs;
• Arcs may be either circular or elliptical;
• Lines that do not meet are either straight or intersect at 90º angles;
• Lines can be either parallel or perpendicular;
• Lines extending beyond an arc will form a grid;
• Tangents cannot intersect directly;
• Circular arcs will have a constant radius, but circles may differ within the design;
• Elliptical arcs have a slope that is ever increasing / decreasing.
Style
• Less formal;
• May be symmetrical;
• Patterns. Of straight-line tangents express rectilinear form;
• Straight-line tangents promote movement;
• Arc segments dominate the design;
• Curves increase the overall flow within the design;
• Arc areas promote pause and gathering areas.
Arc and Radii Line Form
Form
• Two major line segments, straight lines and arcs which are a portion of circles and ellipses;
• Straight-line segments must radiate from the center point of a circle or ellipse;
• The straight-line segments constitute the radius and must be complemented by the presence of at least some portion of the circle or ellipse;
• Straight-line segments must intersect circle or ellipse at an angle perpendicular to the tangent of that arc;
• All radii must intersect at right angles, or run parallel or perpendicular to each other;
• Radii can be of varying lengths;
• Arcs can be of any length and size;
• Straight-line segments will form a grid pattern similar to the rectilinear form.
Style
• Formal style due to the grid pattern that develops;
• Arcs tend to promote gathering spaces;
• Radii dissecting arcs tend to extend space within the arc beyond it;
• Straight-line segments connecting two or more arcs will often promote movement between spaces.
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